2001 TOYOTA SEQUOIA wiring diagram

I28766
R6
Light Control
Rheostat AssyRadio and Navigation Assy
J/C
Steering Pad Switch Assy
Spiral Cable
Sub±assy From
TAILLIGHT
RelayILL±
SWG J/C
ILL+ W±G
GJ39 J40
J39 J40
J39 J40W±G
G
G
G A B
A
AAB
ILL±
T12
2
6 1
10C9±1
BR±W
C9±10 6
4
Steering SWR30
R27 R30 DI±2260
± DIAGNOSTICSNAVIGATION SYSTEM
2454 Author: Date:
2005 SEQUOIA (RM1146U)
Illumination circuit
CIRCUIT DESCRIPTION
Power is supplied to the radio and navigation panel illumination when the light control switch is in the TAIL
or HEAD position. The body ECU determines the external brightness based on the brightness level detected
by the automatic light control sensor, and then operates the TAILLIGHT relay. Power can also be supplied
by operating the relay.
The intensity of the radio receiver panel illumination can be adjusted by the rheostat switch.
WIRING DIAGRAM
DIDDF±01

I28482
Stereo Component
Amplifier Assy
Radio and Navigation Assy
TX+
S10 R30V
P
TX±
S10ATX+
ATX± 20 5
19 15
R30 DI±2268
± DIAGNOSTICSNAVIGATION SYSTEM
2462 Author: Date:
2005 SEQUOIA (RM1146U)
AVC±LAN circuit (Radio and navigation assy ± stereo component
amplifier assy)
CIRCUIT DESCRIPTION
Each unit of the audio system connected to the AVC±LAN (communication bus) transfers the signal of each
switch by communication.
When a short to +B or short to ground occurs in this AVC± LAN, the audio system will not function normally
as communication is discontinued.
In this AVC±LAN, the radio and navigation assy becomes the master of the communication and the has re-
sistance necessary for communication.
WIRING DIAGRAM
DIDDH±01

I28483
Radio and Navigation Assy
R±W 1
7
R28 MUTE
MUTE Stereo Component
Amplifier Assy
S10
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2271
2465 Author: Date:
2005 SEQUOIA (RM1146U)
Amplifier mute signal circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the stereo component amplifier to mute noise. Because of that, the noise pro-
duced by changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.
If there is a short in the circuit, even though the stereo component amplifier assy is normal, no sound or only
an extremely small sound can be produced.
WIRING DIAGRAM
DIDDI±01

I28484
WRadio and
Navigation Assy
G 429
8
R BR30L+
L± Stereo Component
Amplifier Assy
R+
R±
SLD 19
18
10 3
S10
5
(Shielded) L+
L± R+
R±S10
S10
S10
S106
SGNDR30
R30
R30
R30 DI±2274
± DIAGNOSTICSNAVIGATION SYSTEM
2468 Author: Date:
2005 SEQUOIA (RM1146U)
Amplifier sound signal circuit
CIRCUIT DESCRIPTION
The radio receiver assy sends a sound signal to the stereo component amplifier assy through this circuit.
The sound signal that has been sent is amplified by the stereo component amplifier assy, and then sent to
the speakers.
If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunc-
tion in the stereo component amplifier assy or the speakers.
WIRING DIAGRAM
DIDDJ±01

I28478
Stereo Component
Amplifier Assy
IB1 S9
T12
Tweeter LH F14
Front Door Speaker
and Woofer LH
IB1 IB1
IB1
S9S9
S9 WFL+
FL± WFL±
FL+
112 6 1712
2
3 4 23
41
5 4 67
1R G
L±W
L
VP L±W S1023
22
S10 INT+
INT±
G
VP11
13 R27 W
B
(Shielded)Radio and Navigation Assy
IVO+
IVO±
SLD1 R27
R27 DI±2276
± DIAGNOSTICSNAVIGATION SYSTEM
2470 Author: Date:
2005 SEQUOIA (RM1146U)
Speaker circuit (Navigation voice)
CIRCUIT DESCRIPTION
This circuit is used when the voice guidance in the radio and navigation assy is on.
Voice guidance of the navigation system is heard from the front door speaker LH via the tweeter LH.
WIRING DIAGRAM
DIDDL±01

I28477
Stereo Component
Amplifier Assy
IB1 S9 T12
Tweeter LH
F14 Front Door Speaker
and Woofer LH
F15 Front Door Speaker
and Woofer RH
T13
Tweeter RHII2
J/C
BC1
BA1 R10
Rear Door
Speaker RH
R9
Rear Door
Speaker LHJ/C BC1
BA1II2
II2
II2
J49 J48
J49 J48
J34 J33IB1
IB1
IB1S9
S9
S9
S9
S9
S9
S9
S9
S9
S9
S9FL±
WFL+
WFR±
FR+
RR+
RL+ FL+
WFL±
WFR+
FR±
RR±
RL± 11
2
6
17
18
7
3
5 12
14
4
13 2
3 4
1 31
2 4
23
4 1
2
3 4
15
4
6
7
2
1
10
9
11 12
11 12 2 1
2 1I
C
HB
KE
LF V
P
G
L±W LRV
P
G L±W
R Y
L LGR Y
L LG V
P
R
WR
WR
W
Y B
Y B
Y B
J34 J33
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2283
2477 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

I28479
Steering
Pad Switch
Spiral Cable
Sub±assyRadio and Navigation Assy
SW2
SWG SW1 R27
EAUAU2
AU1
EAUAU2
AU1C9±11 GR±R
LG±R
BR±W C9±12
C9±10 11
12
108
7
6 R27
R27
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2287
2481 Author: Date:
2005 SEQUOIA (RM1146U)
Steering pad switch circuit
CIRCUIT DESCRIPTION
This circuit sends an operation signal from the steering pad switch assy to the radio and navigation assy.
If there is an open in the circuit, the audio system cannot be operated by the steering pad switch assy.
If there is a short in the circuit, the resulting condition is the same as if the switch were continuously de-
pressed. Therefore, the radio and navigation assy cannot be operated by the steering pad switch assy, and
the radio and navigation assy itself cannot function.
WIRING DIAGRAM
DIDDO±01

I28480
Combination Meter
SPD G±O 25
C53
R29 J17
J/C
BRadio and Navigation Assy
BG±O
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2291
2485 Author: Date:
2005 SEQUOIA (RM1146U)
Speed signal circuit
CIRCUIT DESCRIPTION
The navigation ECU (built in the radio and navigation assy) receives a vehicle speed signal from the com-
bination meter assy and information about the GPS antenna, and then adjusts vehicle position.
HINT:

A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal
is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respec-
tive system based on the pulse signal.

If a short occurs in an ECU, all systems in the speed signal circuit will not operate normally.
WIRING DIAGRAM
DIDDP±01